Hammer-drill.



F. JONES & W. A. ENDTER.

HAMMER DRILL.

APPLIGATIOK FILED NOV. 4, 1912.

1,1 12,621. Patented 001;. 6, 1914.

2 SHEETSSHEET l,

1 WITNESSES I INQENTORS z 7/ 7 4/7? 07166 M. indie;-

j w, AM,;, Allorney THE NORRIS PErERs c0. PHOTOVLITHOY. WASHINGTON. 0. c

F. JONES & W. A. ENDTER.

HAMMER DRILL.

APPLIOATION FILED NOV. 4 1912.

1 1 1 2,621 Patented Oct. 1914.

2 SHEETS-SHEET 2.

THE NORRIS PETERS 60.. PHGTO-LITHOH WASHINGTON. u 4:,

STATES PATENT OFFTQEQ FRANK JONES AND W'ALDEMAR A. END'IER, OF ROCK ISLAND, ILLINOIS.

HAMMER-DRILL.

Specification of Letters Patent.

Patented Oct. 6, 1914.

Application filed November 4, 1912. Serial No. 729,404.

T all whom it may concern Be it known that we, FRANK JONES and VALDEMAR A. ENDTER, citizens of the United States, residing at Rock Island, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Hammer-Drills, of which the following is a specification, reference being had therein to the accompanying drawmg.

This invention relates to drills, and has for its object the production of an eflicient hammer-drill of the new type wherein the tool may be efficiently used for drilling holes through cement, concrete, tile, brick, rock, and other hard substances.

Another object of this invention is the production of an efficient hand-drill which is provided with means for producing an efficient hammer effect upon a bit to be driven into a hard substance.

WVith these and other objects in view, this invention consists of certain novel constructions, combinations and arrangement of parts, as will be hereinafter fully described and claimed.

In the drawings :Figure 1 is a side elevation, partly in section, of the drill. Fig. 2 is a transverse section through the drill. Fig. 3 is a section taken on line 3-3 of Fig. 1. Fig. 4 is a front view partly in section of the hammer-supporting frame.

Upon referring to the drawings by numerals, it will be seen that 1 designates the frame which is of an elongated rectangular structure having a bit-receiving socket 2 formed near its lower end. A driving bit 3 is adjustably secured within the socket 2 by means of an adjusting screw A yokeportion 5 is formed upon one side of the frame 1 and within the bottom of this yokeportion is placed a hammer-head 6, which hammer-head is adapted to be engaged by the swinging-head 7 of the hammer 8. It will be seen that the frame 1 comprises an outer parallel side-portion 9 and an inner parallel side-portion 10. The inner sideportion 10 is provided with a yoke-frame 11 and within this yoke-frame 11 is pivotally mounted the hammer 8, which hammer is provided with a rearwardly-extending finger 12, having a longitudinally-extending slot 13 formed near the outer end thereof. An adjustable finger 14 is adjustably mounted upon the finger 12 by means of a set-screw l5 and this adjustable finger 14 is provided with a yoke-shaped outer end 15 in which is j ournaled a roller 16. This roller 16 is adapted to be engaged by the ratchet teeth 17 formed upon the ratchet-wheel 18, which ratchet-wheel 18 is pivotally mounted upon a journal pin 20, which journal pin is secured to the inner portion 10 of the frame 1. A crank-handle 21 is secured to the shaft and also to the wheel 18, as illustrated in Fig. 2, for facilitating the rotation of the wheel 18 when it is so desired.

An adjustable arm 22. is secured to the inner portion 10 of the frame 1 and is held in engagement with this frame by means of a pin 23, which pin is adjustably secured in the longitudinally-extending slot 24, which slot 24 is formed in the inner portion of the frame 1. A coil spring 25 is connected to the upper hooked end 26 of the arm 22, and is also connected to the adjustable finger 14, as illustrated in Fig. 1, so as to return the hammer to its normal position after the same has rebounded or has been drawn away from the hammer-head 6.

From the foregoing description, it will be seen that the wheel 18 may be rotated through the medium of the crank-handle 21, thereby causing the hammer-head 7 to be drawn out of engagement with the hammerhead 6 as the ratchet teeth 17 pass under the roller 16. As soon as the ratchet teeth 17 have been removed from the roller 16 the hammer-head 17 will be thrown into engagement with the head 6, so as to drive the bit 3 into the material which is being acted upon. Of course, it should be understood that this spring 25, above mentioned, will greatly facilitate the operation of the hammer and will also add greater force to the blow which is to be struck by the hammerhead 7.

What is claimed is:

A hammer drill comprising a frame having primary and auxiliary parallel side members each having a yoke therein, a bit carried by the base of said primary member, a hammer head in the base of the yoke of said primary member, a shaft extending across the yoke in said auxiliary member, a hammer for causing said hammer headto operate the bit mounted on said shaft, an arm on one end of said hammer, a ratchet wheel journaied to said frame andzach pted In testimony whereof we hereunto affix to engage said arm to rock the same thereby our signatures in presence of two Witnesses. swinging the hammer away from said ham- FRANK JONES. mer head, and autonmtically active means WALDEMAR A. ENDTER. for causing said hammer to strike said harm- 'VVitnesses:

mer head when the ratchet is disengaged HENRY H. humans,

from said arm. *MINNIE HARTKOP.

Copies of this patent may be obtained for five .centsneach, by addressing the Commissioner of Eatents, \washington, D. C. 

